Incandescent-lamp socket.



PATENTED MAY 29, 1906.

N. MARSHALL. INCANDESOENT LAMP SOCKET.

APPLICATION FILED APR.22,1904

UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented May 29, 1906.

Application filed April 22, 1904. Serial No. 20 L419.

T0 aZZ whom it may concern.-

Be it known that I, NORMAN MARSHALL, of Newton, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Incandescent-Lamp Sockets, of which the following is a specification.

The invention relates to incandescentlamp sockets in which the shade-holder forms a permanent part of the socket. Heretofore in such sockets the shade-holder has been formed on or permanently secured to the metallic shell, which forms the outer covering for the socket. It is the usual practice to connect this shell with the cap by which the socket is supported by connecting devices whichv allow the ready detachment of the shell from the ca and which do not rigidly secure the shell rom dis lacement relative to the cap. It frequent y happens, therefore, with the previous constructions, in which the shade-holder is secured to or formed on the shell, that the shell is moved out of alinement with the cap by the Weight of theshade or by accidental striking a ainst the shade. Such movement of the she 1 carries the shade, as well as the lamp carried by the socket, out of proper alinement or relation with the fixture to which the socket is secured.

It is the object of this invention to overcome this objectionable feature in the prior constructions, and this is accomplished by permanently securing the shade-holder to the cap by which the socket is attached to the fixture or support and which acts to support the shell and other parts of the socket. With the shade thus secured to the socket there is no danger that the shade will become displaced or be moved out of proper relation with the fixture to which the socket is secured.

The features of the invention will be understood from a detailed description of the socket shown in the accompanying drawings.

In the drawings, Figure 1 is an elevation of asocket embodying one form of the invention, parts being broken away and shown in section.

ig. 2 is a-plan view of the same, and Fig. 3 is a detached detail showing a different manner of securing the shade-holder to the cap.

The socket shown in the accompanying drawings is provided with the usual metallic cap A, having an internally-screw-threaded boss a, by which the socket is securedto a fixture or support. The ca A is domeshaped and is provided at its oWer end with a cylindrical portion a, which fits over the I upper end of the metallic shell B. The shell B is detachably secured to the ca A by the screws 12, carried by the cap an engaging slots in the shell. The shade-holder is provided with a cylindrical annulus c, which fits about the cylindrical portion a of the cap, and the shade-holder is permanently secured to the cap by spinning or bending the upper edge of the annulus 0 over the upper edge of the cylindrical portion a and by spinning or bending the lower edge of the annulus over the lower edge of the cap. The shade is secured to the shade-holder by means of screws 0, extending through ears 0 which project downward from an annulus C. The annulus G is somewhat larger in diameter than the annulus c and is connected therewith by arms C.

Instead of connecting the shade-holder to the cap by bending inward the edges of the annulus c the cap andshade-holder may be permanently connected together by grooving the parts, as indicated at d in Fig. 3, or the parts may be permanently secured together 1n any other suitable manner.

By permanently securing the shade-holder to the cap the shade is firmly and securely held in fixed relation with the cap, and since the cap is provided with means for securing the socket to the fixture the shade is held. in fixed relation to the fixture without danger of displacement either by its own weight or by accidental shocks or jars.

What I claim, and desire to secure by Letters Patent, is

1. An incandescent-lamp socket having in combination a cap provided with means for securing it to a fixture or support, a shell detachably connected with the cap and a shadeholder permanently secured to and forming a part of the cap, substantially as described. 2. An incandescent-lamp socket having in combination, a cap provided with means for securing it to a fixture or su ort and having a cylindrical portion, a shell l itting the cylindrical portion and detachably connected with the cap, a shade-holder having a part fitting the cylindrical part of the cap and permanently secured thereto, substantially as described.

In testimony whereof I have a'ffixed my signature in presence of two witnesses.

NORMAN MARSHALL. Witnesses IRA L. FISH, KATHARINE A. DUGAN. 

